Green in nomad, oxblood in something else or if you need an oxblood bag.
I got the ace satchel in burgundy, which seemed to match exactly the oxblood nomad when we compared it in the store.
However the green does go with a lot. Even though the oxblood seems more neutral, the green might actually go with more outfits if your wardrobe is neutral. It would be a pop of color vs a close shade of neutral. The oxblood tends toward brown which doesn't necessarily go with as much as green might.
The green goes well with navy, black, brown, white, beige, reds. The oxblood is dark and might blend too much with some browns and reds. It wouldn't show up as much with black or navy.
The green will be a showpiece, but still tastefully neutral. The oxblood will be less noticable.
Look at your shoes. That is the part of my wardrobe that I have trouble getting oxblood to go with. Then look at outerwear, then the other pieces you wear often.